Raw-material carbon composition for carbon material for electrode of electric double-layer capacitor

Abstract

The capacitance per volume of an electric double-layer capacitor can be increased by using a raw-material carbon composition for use in a carbon material for an electrode of the electric double-layer capacitor by applying an activation process, characterized in that the raw-material carbon composition has a volatile content of 1.3% by mass to 15% by mass (both inclusive), and microstrength of 5 to 30% when the volatile content is less than 6% by mass while microstrength of 5 to 20% when the volatile content is 6% or more.

1. A raw-material carbon composition for use in a carbon material for an electrode of an electric double-layer capacitor by applying an activation process, wherein the raw-material carbon composition has a volatile content of 1.3% by mass to 15% by mass (both inclusive), and a microstrength of 5 to 30% when the volatile content is less than 6% by mass and 5 to 20% when the volatile content is 6% or more. 
   
   
     2. The raw-material carbon composition according to  claim 1 , characterized by comprising microcrystalline carbon analogous to graphite. 
   
   
     3. The raw-material carbon composition according to  claim 1 , wherein the volatile content is not less than 1.3% by mass and less than 6% by mass and porosity of the raw material carbon composition is 20 to 30%. 
   
   
     4. The raw-material carbon composition according to  claim 1 , wherein the volatile content is 6 to 15% by mass (both inclusive) and an average interlayer distance d 002  of a graphite crystal in the raw material carbon composition obtained by X-ray diffraction is 0.3445 nm or less. 
   
   
     5. A carbon material for an electrode of an electric double-layer capacitor obtained by applying an activation process to the raw-material carbon composition according to  claim 1 . 
   
   
     6. The carbon material for an electrode of an electric double-layer capacitor according to  claim 5 , characterized in that the activation process is one using an alkali metal compound. 
   
   
     7. The carbon material for an electrode of an electric double-layer capacitor according to  claim 6 , characterized in that the alkali metal compound is sodium hydroxide. 
   
   
     8. A carbon material for an electrode of an electric double-layer capacitor characterized by having a specific surface area of 1800 m 2 /g or more by activating the raw-material carbon composition according to  claim 4 . 
   
   
     9. The carbon material for an electrode of an electric double-layer capacitor according to  claim 8 , characterized in that the activation process is one using an alkali metal compound. 
   
   
     10. An electric double-layer capacitor characterized by comprising an electrode containing the carbon material for an electrode according to  claim 5 . 
   
   
     11. A carbon material for an electrode of an electric double-layer capacitor obtained by applying an activation process to the raw-material carbon composition according to  claim 2 . 
   
   
     12. A carbon material for an electrode of an electric double-layer capacitor obtained by applying an activation process to the raw-material carbon composition according to  claim 3 . 
   
   
     13. The carbon material for an electrode of an electric double-layer capacitor according to  claim 11 , characterized in that the activation process is one using an alkali metal compound. 
   
   
     14. The carbon material for an electrode of an electric double-layer capacitor according to  claim 12 , characterized in that the activation process is one using an alkali metal compound. 
   
   
     15. The carbon material for an electrode of an electric double-layer capacitor according to  claim 13 , characterized in that the alkali metal compound is sodium hydroxide. 
   
   
     16. The carbon material for an electrode of an electric double-layer capacitor according to  claim 14 , characterized in that the alkali metal compound is sodium hydroxide. 
   
   
     17. An electric double-layer capacitor characterized by comprising an electrode containing the carbon material for an electrode according to  claim 6 . 
   
   
     18. An electric double-layer capacitor characterized by comprising an electrode containing the carbon material for an electrode according to  claim 7 . 
   
   
     19. An electric double-layer capacitor characterized by comprising an electrode containing the carbon material for an electrode according to  claim 8 . 
   
   
     20. An electric double-layer capacitor characterized by comprising an electrode containing the carbon material for an electrode according to  claim 9 .